Muffler with plural expansion chambers



y 1949- A. L. WILLAS MUFFLER WITH PLURAL EXPANSION CHAMBERS Filed Oct.22, 1948 Patented July 19, 1949 UNITED STATES PATENT OFFICE MUFFLER WITHPLURAL EXPANSION CHAMBERS Albert L. Willas, Chicago, Ill.

Application October 22, 1948, Serial No. 55,889

6 Claims. 1

This invention relates to a muffler for internal combustion engines andits principal object is to provide a highly efficient muffler of simpleconstruction composed of relatively few parts capable of being readilyassembled, and welded or otherwise rigidly secured together.

Another object is to provide a muffler of circular form in which theinlet conduit thereto extends tangentially to the circular wall of themuffier whereby the exhausting gases are caused to swirl around in themuffler and forced toward centrally located apertures or ports where thegases are permitted to escape and expand into circular chambers fromwhich they are discharged in a muffled condition.

Another object is to provide a circular middle chamber into which theexhausting gases are ad mitted in a tangential direction whereby thegases are caused to swirl towards centrally located apertures or portsand to pass into and expand into circular outer bulged chambers fromwhich they are discharged to outer atmosphere.

Another object is to provide novel means to muffle the noise of theexhausting gases coming Fig. 2 is a longitudinal section partly brokenaway and taken on the line 2-2 of Fig. 3;

Fig. 3 is a vertical cross section taken on the line 3-3 of Fig. 1 andFig. 4 is a horizontal section taken on the line 4-4 of Fig. 2.

Referring to said drawing, the reference character l0, l0 designates twocircular outwardly bulged walls and H, II designates two inwardly bulgedpartitions united at their peripheries to the walls l0 and formingtherewith two circular outer chambers l2, the walls of which bulge fromtheir peripheries to their centers. At or adjacent the middle of eachpartition it is formed with one or more apertures or ports i 3.

A rim i4, united with the walls I!) and partitions H, provides a middlecircular chamber !5 which communicates with the outer chambers throughthe apertures or ports i 3. The side walls H, of the middle chamber aredished inwardly thereby providing a middle chamber which is relativelywide at the periphery and relatively narrow at the middle thereof.

The partitions and rim are formed with extended walls l6, I! that extendtangentially from said partitions and rim with their edges united toprovide an inlet conduit l8 to the middle chamber. The end portions ofsaid extended walls are formed into segments of a cylinder as at I9,united to form a cylindrical inlet conduit which is adapted to beconnected to the exhaust pipe of an internal combustion engine.

The outwardly bulged outer walls H) are embossed outwardly radially asat 20 to provide radial discharge passages 2| and from said outwardlyembossed portions 20, extend walls 22 of the discharge conduit 23. Saidwalls 22 are semi-circular in cross section and merge into flanges 24that are generally parallel, the flanges of one wall extending towardthe flanges of the other wall with their edges united as by welding orotherwise. The walls 22 taper toward their outer ends and they terminatein segments of a circle so as to form a cylindrical end for a dischargeconduit to which an exhaust pipe may be secured.

It is to be observed that the discharge conduit may extend at anydesired angle to the inlet conduit by merely turning the outer walls Inupon the partitions H to bring the discharge conduit at the desiredangle to the inlet conduit before welding the several parts together.

In the operation of the muffier, the exhaust gases discharging from aninternal combustion engine, enter the middle chamber IS in a tangentialdirection and strike the cylindrical rim of the chamber, being therebycaused to swirl around in said chamber and forced toward the middlethereof at an accelerated speed, finally being forced out through theapertures or ports l3 into the outer chambers l2 in which the gases mayexpand and are finally discharged through the discharge conduit. Thenoise of the discharging gases is therefore muffled.

While the exhausting gases from an internal combustion engine come in aseries of puffs,

' when they enter the middle chamber they strike a larger body of gastherein and are cushioned thereby, and as the swirling gases pass onthrough the apertures Hi to the outer chambers there is a steady streamof gas discharging from the discharge conduit.

Having thus described my invention, it is obvious that variousimmaterial modifications may be made in the same without departing fromthe spirit of my invention; hence, I do not wish to be understood aslimiting myself to the exact adjacent the middle thereof, each outerwall and the adjacent partition providing an outer chamber, an inletconduit leading to said middle chamber in a tangential direction theretoand a discharge conduit leading from both outer chamhers.

2. A muiiler comprising two circular outwardly bulged outer walls, twoinwardly dished partitions forming, with said outer walls, two outwardlybulged chambers, each partition having at least one aperture thereinadjacent its center, a rim extending between the edges of said dishedpartitions and forming therewith a'middle circular chamber, the sidewalls of which are dished inwardly, an inlet conduit leading to saidmiddle chamber and extending in a tangential direction thereto and adischarge conduit extending from both outer bulged chambers.

3. A mufiier comprising two circular outwardly bulged outer walls, twocircular inwardly dished partitions secured to and extending fromthe'peripheries of said outer walls and forming therewith two outerbulged chambers, each partition having a centrally located aperturetherein, a circular rim securedto' said partitions at the peripheriesthereof and forming therewith a middle chamber having inwardly dishedside walls, an inlet conduit leading to the said middle chamber andextending in a tangential direction thereto, and a discharge conduitleading from both outer chambers.

4. A mufiler comprising two outwardly bulged circular outer walls, acylindrical wall disposed between the edges of said outer walls, two inwardly dished partitions extending from the peripheries of the outerwalls and providing with the cylindrical wall a middle chamber, therebeing at least one aperture in said dished partitions adjacent themiddle thereof, each outer wall and the adjacent partition providing anouter bulged chamber, an inlet conduit leading to said middle chamber intagential direction thereto, and said outer walls being embossedoutwardly and extended to provide a discharge conduit leading from bothouter chambers.

5. A muffler comprising two circular outwardly bulged outer walls, twoinwardly dished partitions forming, with said outer walls, two outwardlybulged chambers, each partition having at least one aperture thereinadjacent its center, a rim extending between the edges of said dishedpartitions and forming therewith a middle circular chamber, the sidewalls of which are dished inwardly, an inlet conduit leading to saidmiddle chamber extending in a tangential direction thereto, a radiallyextending discharge passage formed on each outer bulged wall, and adischarge conduit leading from said passages.

6. A muiiler comprising two circular outwardly bulged outer walls, twocircular inwardly dished partitions secured to and extending from theperipheries of said outer walls and forming therewith two outer bulgedchambers, each partition having a centrally located aperture therein, acircular rim secured to said partitions at the peripheries thereof andforming therewith a middle chamber having inwardly dished side walls, aninletconduit leading to the said middle chamber and extending in atangential direction thereto, and a radially extending discharge conduitleading from both outer chambers.

ALBERT L. WILLAS.

No references cited.

